:root {
  --bg: #101418;
  --panel: #1a212a;
  --panel-line: #2b3645;
  --text: #eef1f5;
  --muted: #9fabbd;
  --felt: #1d4a30;
  --felt-line: #143521;
  --focus: #ffd23f;
  --legal: #7fe3a0;
  --black-pc: #14161a;
  --white-pc: #f5f1e2;
  --red-pc: #e2483a;
  --blue-pc: #3f8df2;
  --accent: #ffd23f;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", "Segoe UI", system-ui, sans-serif;
  line-height: 1.65;
  padding: 1rem 1rem 3rem;
}
header { max-width: 980px; margin: 0 auto 1rem; }
h1 { font-size: 1.35rem; margin: 0; letter-spacing: .04em; }
.sub { color: var(--muted); font-size: .85rem; margin: .15rem 0 0; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.wrap {
  max-width: 980px; margin: 0 auto;
  display: flex; gap: 1.4rem; flex-wrap: wrap; align-items: flex-start;
}
.board-area { flex: 0 1 auto; }
.side { flex: 1 1 280px; min-width: 260px; display: flex; flex-direction: column; gap: 1rem; }

/* ---- パネル共通 ---- */
.panel {
  background: var(--panel); border: 1px solid var(--panel-line);
  border-radius: 12px; padding: 1.2rem 1.4rem; max-width: 980px; margin: 0 auto 1rem;
}
.panel p { margin: .3rem 0 .9rem; color: var(--muted); }
.btn {
  font: inherit; font-weight: 700; cursor: pointer;
  background: var(--accent); color: #1c1500;
  border: 0; border-radius: 8px; padding: .6rem 1.4rem;
}
.btn.secondary { background: #2b3645; color: var(--text); font-weight: 600; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn:focus-visible, td[role="gridcell"]:focus-visible, input:focus-visible {
  outline: 3px solid var(--focus); outline-offset: 2px;
}
label { display: block; font-size: .85rem; color: var(--muted); margin: 0 0 .3rem; }
input[type="text"] {
  font: inherit; padding: .55rem .7rem; border-radius: 8px;
  border: 1px solid var(--panel-line); background: #0d1217; color: var(--text);
  width: 100%; max-width: 320px;
}
.row { display: flex; gap: .6rem; flex-wrap: wrap; align-items: flex-end; margin-top: .6rem; }

/* ---- ロビー一覧 ---- */
ul.rooms { list-style: none; margin: .6rem 0 0; padding: 0; display: flex; flex-direction: column; gap: .5rem; }
ul.rooms li {
  display: flex; align-items: center; gap: .8rem;
  border: 1px solid var(--panel-line); border-radius: 10px; padding: .6rem .8rem;
}
ul.rooms .rname { font-weight: 700; }
ul.rooms .rmeta { color: var(--muted); font-size: .82rem; margin-left: auto; }
.empty-note { color: var(--muted); font-size: .85rem; margin-top: .6rem; }

/* ---- 盤面 ---- */
#boardApp { display: inline-block; }
table#board { border-collapse: collapse; background: var(--felt-line); border: 4px solid #0d2415; border-radius: 6px; }
#board caption { text-align: left; font-size: .8rem; color: var(--muted); padding: 0 0 .4rem; caption-side: top; }
#board th {
  color: var(--muted); font-size: .72rem; font-weight: 600;
  width: clamp(34px, 9.5vw, 52px); height: 20px; padding: 2px;
}
#board th[scope="row"] { width: 20px; padding: 0 6px; }
#board td {
  width: clamp(34px, 9.5vw, 52px); height: clamp(34px, 9.5vw, 52px);
  padding: 0; text-align: center; vertical-align: middle;
  background: var(--felt); border: 1px solid var(--felt-line);
  cursor: pointer; user-select: none; position: relative;
}
#board td:focus { outline: 3px solid var(--focus); outline-offset: -3px; z-index: 1; }
#board td.legal::after {
  content: ""; position: absolute; inset: 0; margin: auto;
  width: 26%; height: 26%; border-radius: 50%;
  border: 2px dashed var(--legal); opacity: .9;
}
.piece {
  display: inline-block; font-size: clamp(20px, 6vw, 32px); line-height: 1;
  transform: translateY(1px);
}
.p1 { color: var(--black-pc); text-shadow: 0 0 2px #aab4c2, 0 0 1px #aab4c2; }
.p2 { color: var(--white-pc); text-shadow: 0 1px 2px #00000088; }
.p3 { color: var(--red-pc); }
.p4 { color: var(--blue-pc); }

/* ---- サイドパネル ---- */
.card {
  background: var(--panel); border: 1px solid var(--panel-line);
  border-radius: 12px; padding: .9rem 1.1rem;
}
.card h2 { font-size: .95rem; margin: 0 0 .5rem; letter-spacing: .05em; }
#turnBadge { font-size: 1.15rem; font-weight: 700; }
#modeNote { color: var(--muted); font-size: .82rem; margin: .2rem 0 0; }
.badge { display: inline-block; font-size: .78rem; font-weight: 700; border-radius: 999px; padding: .12rem .7rem; }
.badge.spectator { background: #3a2b00; color: var(--accent); }
.badge.you { background: #15302a; color: var(--legal); margin-left: .4rem; }
.badge.host { background: #2b3645; color: var(--text); margin-left: .4rem; }
.badge.off { background: #3a1a1a; color: #ff9a8a; margin-left: .4rem; }

ul.seats { list-style: none; margin: 0; padding: 0; }
ul.seats li {
  display: flex; align-items: center; gap: .55rem;
  padding: .25rem 0; font-variant-numeric: tabular-nums;
}
ul.seats li .piece { font-size: 20px; width: 24px; text-align: center; }
ul.seats li.now { font-weight: 700; }
ul.seats li.now::after { content: "◀ 手番"; color: var(--accent); font-size: .75rem; margin-left: auto; }
ul.seats .seat-count { margin-left: auto; }

dl.keys { margin: 0; font-size: .84rem; display: grid; grid-template-columns: auto 1fr; gap: .15rem .8rem; }
dl.keys dt { color: var(--accent); font-family: ui-monospace, "Consolas", monospace; white-space: nowrap; }
dl.keys dd { margin: 0; color: var(--muted); }

#log { font-size: .82rem; color: var(--muted); max-height: 12em; overflow-y: auto; margin: 0; padding-left: 1.2em; }
#log li { margin: .1em 0; }

.toolbar { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: .9rem; }
[hidden] { display: none !important; }
@media (prefers-reduced-motion: no-preference) {
  .piece.flip { animation: pop .25s ease-out; }
  @keyframes pop { 0% { transform: scale(.4); } 70% { transform: scale(1.15); } 100% { transform: scale(1); } }
}